Grinding and polishing device



Feb. 20, 1934. E. POEGGEL GRINDING AND POLISHING DEVICE Filed July 23,1931 3 Sheets-Sheet l E g z N n flwA m e m Feb. 20, 1934. E. POEGGELGRINDING AND POLISHING DEVICE Filed July 23 1951 3 Sheets-Sheet 2INVENTOR 2m PM H Feb. 20, 1934. E P E L 1,948,128

GRINDING AND POLISHING DEVICE Filed July 23, 1931 3 Sheets-Sheet 3 Fig./0.

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ATTORNEYS Patented Feb. 20, 1934 GRINDING AND POLISHING DEVICE ErichPoeggel, Remscheid, Germany Application July 23, 1931, Serial No.552,703, and: in Austria November 22, 1930 10 Claims.

This invention relates to machines for the grinding and polishing of sawblades of all kinds and similar articles in hand and circular form, andconsists essentially in the process of grinding or polishingsimultaneously and uniformly on both sides such articles between twogrinding or polishing discs of the same size, arranged radially to eachother and moving in opposite directions, and of the feed arrangementsfor the individual and various saw blades and other articles to be dealtwith by the new machine, as well as the equipment of the grindingmachine itself.

By the new process is achieved the simultaneous and uniform grinding onboth sides of the articles to be handled in one passage through themachine, the finish of the individual articles being absolutely uniform.The same also applies to the arrangement as a polishing machine. By theadjustment of the stones or polishing discs, which is possible at anytime, even while working, and by which means the central plane betweenthe two grinding or polishing discs is always maintained at the samelevel, wear of the discs is immediately compensated for without anyinterruption of work. Thereby it becomes possible to fit the grindingand polishing work into the regular flow of the manufacturing processwithout other special measures.

The enclosed drawings represent an example of a machine according to thenew process, also an example of the feeding arrangements for pushing ordrawings the articles through the grinding or polishing machine.

Figs. 1 and 2 show the sample drawing of the grinding equipment, seenfrom the back and from the side respectively.

Fig. 3 shows the raising and lowering equipment for the internal leversof the shears, section IIIIII through Fig. 2.

Fig. 4 shows the feed device for articles of band form in side View,Fig. 5 in section through VV of Fig. 4, Fig. 6 a View looking down onthe feed device, and Fig. l a plan looking down on the slide plate forthe feed device.

Fig. 8 shows the application of the feed device as Figs. 4 to 6 inrelation to the grinding machine, as it would be used for the backgrinding of band type saws.

Fig. 9 gives a side View and part section of the feed device forcircular saws, while Fig. 10 shows the forward movement mechanism of thefeed device as Fig. 9.

For the application of the process there are used the grinding orpolishing discs 1 and 2, ar-

ranged in the same plane, radially to one another, and of the samediameter. In the example illustrated the spindles of these discs arecarried in the two bearings 3 and l, which are guided vercally by meansof the slide 10 in the guides 11 0 arranged on the inside of thestandard 12. On the upper side of the bearings 3 and 4 there areprovided at both ends two forks 5, into which the raising and loweringscissors are respectfully articulated. The latter are formed of the twoscissor levers 7 and 8 and the link pieces 9, the free ends of whichengage in the fork 5 of the bearings. By this arrangement the bearings 3and 4 are counterbalanced with the stones 1 and 2, so that adjustment ofthe stones is very light and easy, a fact which is of great importancefor accurate setting for grinding and polishing, and for thereadjustment while the machine is working. The raising and lowering inthe example represented are likewise carried out ,by [5 means ofscissors. To this end, the internal levers are fixed on a hollow spindle13 and the external levers 8 on a spindle 15 passing through the hollowshaft 13. The hollow'shaft 13, which at the same time serves as abearing for the spindle 15, is itself mounted in the bearing plate 32,which is fixed on one side to the standard 12 and on the other side issupported by the column 33; on the hollow shaft 13, which rigidlyconnects together the two internal levers 7, there is arranged a toothedsegment 14, and on the spindle 15, which rigidly connects together theexternal levers 8 of the scissors, there is a toothed, segment 16. Bothtoothed segments are moved simultaneously, but in opposite directions,by means of suitable transmission gearing, by the hand-wheel 17. Thegearing in the example consists of the chain-wheel 18, the chain19, gearwheels 20 to 29, the last of which engages in the toothed segment 14,for the internal levers, and of the chain-wheel 18, the chain 19,chainwheel 20, gear-wheels 21 to 26 and 30-31, the last of which engagesin segment 16, for the external-levers. The raising and lowering of thegrinding or polishing discs may also be effected 1.00 by a screw spindleor spindles or by hydraulic means or any other suitable arrangement. Itis only important that the lowering or raising of the lower set of partsshall take place simultaneously and uniformly with the opposing movementof the upper set or" parts. As both above and below the same wear of thetwo discs takes place, owing to the uniform grinding or polishing workof the discs, the position of the centre plane xa: is always at the samelevel. Therefore a correct feed-in of the work is ensured by thesubsequently described feed device, in such a way that no unilateralpressure against one or the other disc can take place due to bending.The drive of the grinding discs is effected in the example illustratedby belt pulleys: the drive can, however, be by direct coupled motors orby any other method. It is advisable that the speed drives of the twodiscs should be interdependent, in order to ensure the same speed forboth stones or polishing discs. The drive in Fig. 2 with belt pulley andshaft, 34 to 36, serves to actuate the feed devices for the work.

The feed device as shown in Figs. 4 to 6 serves for the pushing orpulling through of the bandshaped articles being worked, such as framesaws, mill saws, cross-cut saws, etc., between the discs 1 and 2. Forthis purpose the two pairs of pressure rollers 37 and 38 are provided.The rollers are fixed on the spindles 41, having their bearings in theend heads of the levers 39 and 40. The two scissors formed by theselevers are dependent on each other as regards their movement. The twoexternal levers 39 are keyed on the spindle 51, while the internallevers 40 are fixed on the hollow shaft 50, which is pushed on to thespindle 51 on which it is free to turn. The ends of the spindle 51 aremounted in the bearings 52 and 53. Movement is imparted to the scissorsby the link pieces 43 and the cross piece 42. The latter is rigidlyconnected with the sliding shoe 44, which moves vertically in the guide45. The guide 45 is made in one piece with the standard 46. By thedepression of the foot lever 4'7 the sliding shoe 44 is carrieddownwards by means of the connecting rod 48 and with it also the crossbar 42 is moved down, this causing the rollers 37 and 38 to be forcedapart. If the foot lever 4"? is released, the pressure rollers arepressed together by the spring 49 which operates under the slide 44, sothat here the necessary pressure for the forward feed of the work to thegrinding discs is available, in order to push or pull the work throughbetween the stones or polishing discs, notwithstanding the opposingdirection of one or other of these discs to the direction of feed, inthe plane of grinding xa'. The rotation of the rollers for the feed ofthe work is imparted by the shaft 55 carrying the belt pulley 56. Tothis end the shaft 55 is coupled in any suitable way with the shaft 36(Fig. 2). The motion of the pulley 56 is transmitted by the belt 5'7 tothe belt pulley 58, rigidly connected with the gear wheel 59, and thenceby gear wheels 60, 61 and the pair of gear wheels 62 to the pair ofrollers 33, and by gear wheels 63, 64, 65 and the pair of gear wheels 66to the pair of rollers 37. The bearing 52 for the shaft 51 forms at thesame time the head of the standard 46, while the bearing 53 is carriedby the columns 54.

To exchange the discs 1 and 2, the space in front of the machine must befreed, therefore the feed device for the work must be withdrawn from themachine. For this purpose the foundation plate 67 is provided with sliderails 68, carried in grooves '70 in the slide plate 69. The slide plate69 is rigidly connected with the foundation plate 71. By means of thisdevice the feed device can be rapidly brought back into correct positionafter the exchange of the discs 1 and 2 has been effected.

Fig. 7 shows the foundation plate 69 with the slide grooves for the feeddevice from above. In this case the plate also serves for the setting upof the feed device as Fig. 8. The plate 69 there fore has, in additionto the slide grooves 76, vertical grooves 72 for this purpose, intowhich the feed device with the slide rails 68 is inserted, when thegrinding device is to be used for back grinding. Back grinding of sawsserves to taper off the back so that the saw will cut freely. In orderto achieve this tapered grinding, the saw in the new process, is pushedor pulled through between the two grinding discs in the axial directionvertical to the plane of the discs, the back of the saw reaching almostto the centre plane passing through the two spindle axes. This explainsalso the position of the feed device for the feeding of the work intothe grinding device in Fig. 8. As the feed device is the same as that inFigs. 4 to 6, no description need be given. In order that the workshould not be obstructed in being fed through the machine and in beinghauled off the machine by the scissors levers for lowering or raisingthe grinding discs 1 and 2, which would otherwise be in the way, thelever '7 of both scissors is made as may be seen in Fig. 1.

The feed of the work in the processes indi cated above can also beeffected in other ways: the only important feature is that the feedthrough the grinding path of both stones or polishing discs shall beuniform and reliable.

For the grinding and polishing of circular saws and other circulararticles it is necessary to push the work through between the grindingor polishing discs with a rotary motion, the work being at the same timepushed further into the grinding or polishing device, so that beginningat the periphery and ending at the centre the whole surface may beuniformly ground. In order to save time, it important that the fartherthe disc being worked penetrates into the machine the higher shall bethe speed of rotation of the disc, i. e. the speed of rotation of thework must be dependent on the radius of the circular area at the momentbeing worked. Further, in order that the grinding or polishing machineshall, so far as possible, be always uniformly loaded, the feed of thework into the machine at each revolution of the circular disc mustalways be the same. Hereby it is achieved that the output of work of thegrinding or polishing machine is approximately the same at any settingof the circular saw blade between the grinding discs. The ar rangementillustrated in Figs. 9 and 16 is an ex ample of a feed device operatingin this way.

The rotary movement of the circular article being worked, 73, isimparted by the two pressure rollers '74 keyed on the ends of the shafts'75. These shafts are movable but do not rotate in the hollow shaft '76,so that the rotation imparted by the belt pulley 7'7 and the pair ofgear wheels 78 to the shafts 76 is transmitted to the pressure rollers74. The telescopic shafts l5-76 are bushed in the bearing head 79 of thestandard 30 and also in the adjustable segments 81. The segment 81 isguided by means of the two sliding jaws 82 and 83 in the slide guides 84made in one piece with the standard 80. If the circular disc 73 is setin rotation by the pressure rollers 74, the friction roller 85 is alsorotated. This is rigidly connected with the gear wheel 86, whichtransmits its movement to the gear wheel 87. The latter drives the worm.88, by which in turn is driven the worm wheel 89. The worm wheel 89 iskeyed on the shaft 36, the near end of which is pivoted in the slider92. The first portion of the shaft 90 is screwed, and engages with theslide jaw 82 arranged as a nut. The other end 91 of the shaft is smooth,and pivots and slides in the correspondingly bored slide jaw 83. Theshaft and 91 is formed as a hollow shaft, and is threaded internally atthe end 91: in the threaded end engages the screwed rod 93, which isfixed so as not to rotate with the trunnion 94 in the bearing head 79.The pitch of the external thread on the shaft 90 is the same as that ofthethread on the rod 93. However, if the thread on the shaft so is aright hand thread, that of the threaded rod 93 must be left hand. Thusif the shaft 9i)9l is rotated to the right by the worm wheel 89, thesegment 81 with the rollers '74 is thereby turned towards the slider 92,since the thread. on the shaft $0 is screwed into the slide jaw 82. Atthe same time, however, the hollow shaft 30 91 is also moved by the lefthand screw on the threaded rod 93 at the same speed and in the samedirection as imparted to the slide jaw 32 on the shaft 90. Thus thesegment 81 is moved at twice the speed of the slider 92 with thetrunnicn 95. By this means the rollers 74 are displaced on the worktowards the centre thereof to the same extent as the forward feed of thework in the grinding device takes place. The trunnion 95 is flattened onthe grinding disc side, so that the work can be ground right up to thetrunnion hole. On both sides of the slider 92 there is a ranged a guidearm 96, in the slide $7 of wn: there is arranged movably a slider 98,carrying an overhung bearing 99 in which the roller 100 mounted. Thisroller which is radially adjustable to suit the size of the saw bladesbeing worked, by means of the sliding piece 98, has as its purpose toguide the work before and behind the entry into and the exit out of thegrinding zone. Gn the other hand, however, the necessary counterpressure for the friction disc 85 is also provided hereby.

If the feed device 8589 is arranged detachably and additionally for handdrive, the whole device can be quickly turned back by this after thegrinding or polishing process.

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim is:

1. Apparatus for grinding and polishing saw blades and similar articles,comprising an upper grinding and polishing disc, a lower grinding andpolishing disc, means for supporting the upper disc, means forsupporting the lower disc, a pair of links pivotally connected with thefirst-mentioned means, another pair of links pivotally connected withthe second-mentioned means, a plurality of members, each one of saidmembers being connected with one of said links, and means connected withsaid members for moving the same, two of said members connected with twolinks forming one of said pairs of links being moved in oppositedirections by the last-men tioned means.

2. Apparatus for grinding and polishing saw blades and similar articles,comprising an upper grinding and polishing disc, a lower grinding andpolishing disc, means for supporting the upper disc, means forsupporting the lower disc, a link connected with the first-mentionedmeans, another link connected with the second-mentioned m ans, meansconnected with said links for moving the same; a feed device cooperatingwith said discs and comprising a pair of feed rollers, a support, a pairof levers rotatably mounted in said support, each one of said rollersbeing carried by a separate lever, a shoe sliding in said support, meansconnecting said sliding shoe with one of said rollers, a foot. lever,means connecting said foot lever with said sliding shoe, and resilientmeans pressing against said sliding shoe.

3. Apparatus for grinding and polishing saw blades and similar articles,comprising an upper grinding and polishing disc, a lower grinding andpolishing disc, means for supporting the upper disc, means forsupporting the lower disc, a link connected with the first-mentionedmeans, another link connected with the second-mentioned means, meansconnected with said links for moving the same; a feed device for theback grinding of saw blades comprising two pairs of feed rollers, eachone of said pairs being situated at one side of said discs, the axes ofsaid rollers being perpendicular to the axes of said discs, a support, apair of double-armed levers rotatably mounted in said support, each oneof said levers carrying two feed rollers belonging to different pairs, ashoe sliding in said support, means connecting said sliding shoe withtwo of said fee rollers belonging to different pairs, a foot lever,means connecting said foot lever with said sliding shoe, and resilientmeans, pressing against said sliding shoe; and means for moving saidfeed device with respect to said discs.

i. Apparatus for grinding and polishing saw blades and similar articles,comprising an upper grinding and polishing disc, a lower grinding andpolishing disc, means for supporting the up er disc, means forsupporting the lower disc, a link connected with the first-mentionedmeans, another link connected with the second mentioned means, meansconnected with said links for moving the same, and a feed device forcircular blades cooperating with said discs, and comprising a pair ofpressure rollers, said pressure rollers being adapted to come in contactwith a circular blade on both sides of the latter, means for rotatingsaid pressure rollers, a threaded shaft, means for rotating said shaft,the last-mentioned means being actuated by said circular blade, and amember engaging said threaded shaft and carrying said pressure rollers.

5. Apparatus for grinding and polishing saw 0 blades and similararticles, comprising an upper grinding and polishing disc, a lowergrinding and polishing disc, means for supporting the upper disc, meansfor supporting the lower disc, a link connected with the first-mentionedmeans, another link connected with the second-mentioned means, meansconnected with said links for moving the same, and a feed device forcircular blades cooperating with said discs, and comprising a pair ofpressure rollers, said pressure rollers being 130 adapted to come incontact with a circular blade on both sides of the latter, a rolleradapted to be rotated by said circular blade, a hollow shaft havinginternal and external threads, a wheel rigidly connected with saidshaft, means for transmitting the motion of the last-mentioned roller tosaid wheel, a member carrying said pressure rollers and engaging theexternal thread of said shaft, and a threaded rod engaging the internalthread of said shaft.

6. In an apparatus for grinding and polishing saw blades and similararticles, a pair of grinding and polishing discs, separate meanssupporting each of said discs, a pair of two-armed levers, a pluralityof links, each link connecting a separate end of one of said levers withone of said supporting means, and means supporting said leversintermediate their ends and adapted to oscillate the same simultaneouslyin opposite directions and thereby adjust the-relative positions of saidgrinding and polishing discs.

7. In an apparatus for grinding and polishing.

saw blades and similar articles, a pair of grinding and polishing discs,separate means supporting each of said discs, a pair of two-armedlevers, a plurality of links, each link connecting a separate end of oneof said levers with one of said supporting means, a hollow spindleconnected with one of said levers, another spindle situated within saidhollow spindle and connected with the other one of said levers, toothedsegments connected with said spindles, and a gear mechanism for rotatingsaid spindles, said gear mechanism. comprising gear-Wheels meshing withsaid toothed segments.

8. In an apparatus for grinding and polishing saw blades and similararticles, a pair of grinding and polishing discs, separate meanssupporting each of said discs, a pair of two-armed levers, a pluralityof links, each link connecting a separate end of one of said levers withone of said supporting means, means supporting said levers intermediatetheir ends and adapted to oscillate the same simultaneously in oppositedirections and thereby adjust the relative positions of said grindingand polishing discs, and a removable feeding device cooperating withsaid discs and comprising a pair of feed rollers adapted to come incontact with the article to be treated on both sides of the latter.

9. In an apparatus for grinding and polishing saw blades and similararticles, a pair of grinding and polishing discs, separate meanssupporting each of said discs, a pair of two-armed levers, a pluralityof links, each link connecting a separate end of one of said levers withone of said supporting means, means supporting said levers intermediatetheir ends and adapted to oscillate the same simultaneously in oppositedirections and thereby adjust the relative positions of said grindingand polishing discs, and a removable feeding device cooperating withsaid discs and comprising two pairs of feed rollers, each pair beingadapted to come in contact with the article to be treated on both sidesof the latter, a pair of two-armed levers, each lever carrying aseparate feed roller at each of its ends, means oscillatably supportingsaid levers intermediate their ends, means connected With said leversfor simultaneously oscillating the same in different directions, andmeans for rotating said feed rollers.

10. In an apparatus for grinding and polishing saw blades and similararticles, a pair of grinding and polishing discs, separate meanssupporting each of said discs, a pair of twoarmed levers, a plurality oflinks, each link connecting a separate end of one of said levers Withone of said supporting means, means supporting said levers intermediatetheir ends and adapted to oscillate the same simultaneously in opposite100 directions and thereby adjust the relative positions of saidgrinding and polishing discs, and a removable feeding device cooperatingwith said discs and comprising a pair of feed rollers adapted to come incontact with a disc-shaped article 1515 on both sides of the latter,means for rotating said feed rollers, the rotation of said feed rollersbeing transmitted to the disc-shaped article, and means for radiallymoving said feed rollers with respect to the disc-shaped article duringthe ro- 110 tation thereof.

ERICH POEGGEL.

